Door lock

ABSTRACT

This is a three in one lock having a sliding bolt adapted to be engaged in a keeper, and having a keyed tumbler operated detent for locking the bolt against withdrawal from the keeper and for locking the bolt in released position, and having a headed pin which can be used as a chain door guard and which for this purpose is adapted to be inserted in an elongate slot in the bolt and which is secured to one end of a chain that is fastened at its other end to the keeper.

United States Patent 1 1 3,788,107 Lippman Jan. 29, 1974 [54] DOOR LOCK2,724,257 11/1955 Segal 70/93 [75] Inventor: Aaron H. Lippman,Rochester, N.Y. 7 Primary Examiner Marvin A Champion [73 Assignee:Brainerd Manufacturing Co., (i Examiner "Richard T y V, ,7

Rochester, N Attorney, Agent, or Firm- Shles1nger,Fitzsimmons &

Shlesin er 22 Filed: June 9, 1972 WM w. WM. 211 Appl. No.: 261,228 [571ABSTRACT I This is a three in one lock having a sliding bolt 2 70adapted to be engaged in a keeper 3 having a E g Eosb i g2 keyed tumbleroperated detent for locking the bolt [58] Fieid "70/93 592/150 264against withdrawal from the keeper and for locking the bolt in releasedposition, and having a headed pin [56} References Cited which can beused as a chain door guard and which for this purpose is adapted to beinserted in an elon- UNITED STATES PATENTS gate slot in the bolt andwhich is secured to one end of Segal X a hain is fastened at its otherend to the'keeper 3,487,666 1/1970 Richards ..70/129 X 2,105,714 1/1938West 292/264 3 Claims, 9 Drawing Figures DOOR LOCK The present inventionrelates to door locks, and more particularly to door locks comprising aslidable bolt and a keeper therefor.

There are many different devices for locking doors. Commonly, however,they fall into three principal classes, namely, the tumbler type lock,the sliding bolt type lock, and the chain door guard. In the tumblertype lock, a key is inserted into a rotatable barrel that is mounted inthe door, to rotate the barrel and move a catch into or out ofengagement with the keeper, which is mounted on the door jamb. Slidingbolt locks ordinarily consist of a slidable heavy duty bolt that ismounted on the door, and that is movable manually into or out ofengagement with a keeper mounted on the door jamb. Chain door guards areused to limit the amount of movement of a door, that is a distance towhich it can be opened, so as to permit a householder, for instance, totalk to someone on the outside of the door without opening it so fullythat the person on the outside can intrude into the house. Such doorguards,

also, are used to permit circulation of air from the outside into a roomthrough a partially open door, but without allowing the door to beopened far enough for an intruder to enter therethrough. Usually, thechain is secured at one end to a fixture on the door jamb, and carries apin or knob at its other end which is inserted in a keeper on the door,to limit opening of the door.

When out of use, the pin or knob is inserted into a slot in the fixtureon the door jamb.

Sometimes householders will use all three types of locks to preventunauthorized entry into a home, one type of lock being mounted above theother on the door, with the three cooperating parts mounted one abovethe other on the door'jamb. The use of all three types of locks is,however, expensive, and often unsightly, and sometimes difficult toinstall, and moreover, requires three different operations on the partof the householder to securely lock .a door, and to open it again.

One object of the present invention is to provide a door lock which willbe cheaper and simpler to install than the three described previoustypes of locks, but which canbe used to perform the functions of allthree, and provide what in effect is a three-in-one door lock, namely, akeyed tumbler lock, a heavy-duty bolt, and a chain door guard.

Other objects of the invention are to provide a lock of the typedescribed which will take up a minimum of space, and provide a piece ofhardware which is attractive in design, and which is more effective inprotection of a home than the three separate types of locking devicespreviously employed. 7

Other objects of the invention will be apparent hereinafter from thespecification, and from the recital of the appended claims, particularlywhen read in conjunction with the accompanying drawings.

In the drawings:

FIG. 1 is a side elevation showing a door lock made in accordance withone embodiment of this invention, and disposed in a position of use;

FIG. 2 is a plan view of this lock with thebolt in released position; I

FIG. 3 is a view looking at the left-hand end of FIGS. 1 and 2:

FIG. 4 is a view looking at the right-hand end of FIGS. 1 and 2; 1

FIG. 5 is a section on the line 5--5 of FIG. I looking in the directionof the arrows;

FIG. 6 is a rear view of the bolt and its casing with the closure plateremoved, showing the tumbler actuated detent in full lines in positionpreventing the bolt from being withdrawn from its keeper, and showing indotted lines the detent in released position;

FIG. 7 is a similar view showing the detent in full lines engaged withthe bolt and securing the bolt in released position, and showing indotted lines the detent in fully released position;

FIG. 8 is a detail sectional view of the tumbler and detent; and

FIG. 9 is a perspective view of the bolt.

Referring now to the drawings by numerals of reference, l0 denotes thehousing for the bolt. This is provided with integral flanges 11, and isfastened to the door 12 by screws 14, which pass through holes 13 in theflanges 11 and thread into the door. The housing, which may be of brass,for instance, is formed with a longitudinal recess or groove 15 (FIG. 5)in which a heavy-duty bolt 16 in slidable. The bolt has an elongatelongitudinal groove 18 (FIGS. 5 and 9) inits upper surface. This grooveis aligned with an elongate keyhole slot 20 in the upper surface of thehousing 10. The slot 20 terminates in an enlarged portion 22. I

The bolt 16 is provided with spaced cars 28 at one side between which ahandle 30 (FIGS. 1 and 5) is secured by a pin 32 (FIG. 5). The handleprojects outwardly through a slot 34 in one side of the housing so as topermit sliding the bolt manually in the housing to and from lockingposition.

The bolt also has a projection or tongue 36 (FIGS. 6, 7 and 9) at oneend, which is formed with a kerf 38 in its underside.

Mounted in the housing 10 at a place below and beyond the inner end ofthe head 22 of the slot 20 to slide at right angles to the direction ofmovement of the bolt 16 is a detent 40 which has a projection 42 (FIGS.6, 7 and 8) thereon adapted to engage in the kerf 38 of the bolt inorder to lock the bolt in its retracted position shown in FIG. 7. Thisprojection also operates to hold the bolt in its extended, lockingposition by being moved behind the extended bolt, as shown in FIG. 6.The detent 40 slides between parallel guide surfaces 44 formed in thehousing.

The detent is manipulated to and from the positions shown in FIGS. 6 and7 by a rotary key-operated tumbler 46, which has a pin 48 in its lowerend that engages in a cam slot 50 formed in the detent. When the tumbler 46 is rotated, the pin 48 acts like a crank pin to move the detent40 to and from operative position. The tumbler 46 has a slot 52 (FIG. 1)in it to receive a suitable key 54 (FIG. 8) for manipulating it.

A keeper 60 is secured to the jamb 62 of the door by screws 64, and isrecessed to receive the bolt 16 when the bolt is in its extendedposition, shown in FIGS. 1 and 6. The keeper has a chain 68 riveted orotherwise secured to it'at one end, and which carries at its free end apin 70 which has a first flange 72 on it that is of slightly largerdiameter than the width of slot 20 and that is adapted to ride on theoutside of the housing. This pin is formed also with a second flange 74which is small enough to pass through the portion 22 of the slot 20 ofthe housing and be engaged in the slot 18 of the bolt, when the head 74is passed through the enlarged portion 22 of slot 20 and slid along theslot, but which is larger in diameter than the main portion of slot 20so that it cannot be disengaged from the bolt until it is brought intoregistry with the portion 22 of the slot.

In use, the door lock of the present invention is, in effect, athree-inone lock. When the door is closed, the bolt can be slid out ofthe housing, by manipulating handle 30, into the keeper 60 to secure thedoor locked as would be done with an ordinary heavy-duty bolt. Forfurther protection, the tumbler 46 can be rotated by a key 54, when thebolt is in locking position, to move the detent 40 into position behindthe extended bolt, as shown in FIG. 6, absolutely to prevent the boltfrom being moved out of locking position. For further security, thelocking pin 70 of the chain door guard can be engaged in the bolt byinserting its head 74 through the enlarged portion 22 of the slot 20 andsliding the pin along this slot.

To unlock the door, the tumbler 46 is rotated by the key 54 to move theprojection 42 of the detent 40 from behind the bolt; and the bolt can beslid by the handle 30 to the disengaged position shown in FIG. 7. Toretain it in this position, the tumbler can be rotated again by thescrew 54 to engage the lug or projection 42 of the detent in the slot 38of the projection 36 of the bolt as shown in FIG. 7.

If it is desired to guard against unwanted intruders, the pin 70 of thechain door guard can be left engaged in the slot 20 of the housing. Toopen the door freely, the pin 70 needs only to be slid along the slot 20to the enlarged portion 22 thereof, and lifted out of engagement withthe housing. A hole 76 (FIG. 3) is provided in the keeper 60, oppositethe side through which the bolt 16 enters the keeper, to receive thehead 74 of the pin 70 when the pin is not in use, so that it will notdangle down.

A flat plate 78 (FIGS. 5 and 8) is riveted to the back of housing 10 tohold the parts assembled in the housing. The rivets may be fastened inthe holes 79 (FIGS. 6 and 7) in the housing.

While the invention has been described in connection with a specificembodiment thereof, and a particular use therefor, it will be understoodthat it is capable of further modification and use, and this applicationis intended to cover any modifications and uses, of the invention thatcome within the disclosure and the recital of the appended claims.

Having thus described my invention, what I claim is: l. A door lockingmechanism comprising a housing, a bolt slidable longitudinally in saidhousing and movable manually to and from locking position, a keeper inwhich said bolt is engaged when it is in locking position, a chain doorguard comprising a chain fastened at one end to said keeper, and aheaded pin secured to the other end of said chaim, said bolt having alongitudinal slot therein, and said housing having therein alongitudinallyextending keyhole slot registering with the slot in saidbolt and having in one end thereof an enlarged opening through which thehead of said pin may be inserted releasably to engage in said slots tolimit the opening of a door to which said housing is fastened, akey-operated tumbler rotatably mounted in said housing, means forreleasably securing said bolt in its locking position, and meansconnecting said last-named means to said tumbler to be operated therebyto and from securing position, said head of said pin being slightlywider than said keyhole slot and narrower than the slot in said bolt,whereby when said pin is engaged in said slots it is slidablelongitudinally relative both to said bolt and to said housing. I 2. Adoor-locking mechanism as claimed in claim 1, wherein said slot in saidbolt is approximately the same length as said keyhole slot in saidhousing, whereby, while said pin is engaged in said slots, said bolt canbe slid longitudinally in said housing to and from its locking position.

3. A door-locking mechanism as claimed in claim 1, wherein said housinghas therein a second, longitudinally extending slot extending parallelto said keyhole slot, and a detent is secured to and projects from oneside of said bolt intermediate the ends thereof, and slidably throughsaid second slot in said housing to the exterior thereof to enablemanual sliding movement of said bolt in said housing.

1. A door locking mechanism comprising a housing, a bolt slidablelongitudinally in said housing and movable manually to and from lockingposition, a keeper in which said bolt is engaged when it is in lockingposition, a chain door guard comprising a chain fastened at one end tosaid keeper, and a headed pin secured to the other end of said chaim,said bolt having a longitudinal slot therein, and said housing havingtherein a longitudinally-extending keyhole slot registering with theslot in said bolt and having in one end thereof an enlarged openingthrough which the head of said pin may be inserted releasably to engagein said slots to limit the opening of a door to which said housing isfastened, a key-operated tumbler rotatably mounted in said housing,means for releasably securing said bolt in its locking position, andmeans connecting said last-named means to said tumbler to be operatedthereby to and from securing position, said head of said pin beingslightly wider than said keyhole slot and narrower than the slot in saidbolt, whereby when said pin is engaged in said slots it is slidablelongitudinally relative both to said bolt and to said housing.
 2. Adoor-locking mechanism as claimed in claim 1, wherein said slot in saidbolt is approximately the same length as said keyhole slot in saidhousing, whereby, while said pin is engaged in said slots, said bolt canbe slid longitudinally in said housing to and from its locking position.3. A door-locking mechanism as claimed in claim 1, wherein said housinghas therein a second, longitudinally extending slot extending parallelto said keyhole slot, and a detent is secured to and projects from oneside of said bolt intermediate the ends thereof, and slidably throughsaid second slot in said housIng to the exterior thereof to enablemanual sliding movement of said bolt in said housing.